chrome/browser/ui/views/frame/browser_frame_header_ash.h

// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CHROME_BROWSER_UI_VIEWS_FRAME_BROWSER_FRAME_HEADER_ASH_H_
#define CHROME_BROWSER_UI_VIEWS_FRAME_BROWSER_FRAME_HEADER_ASH_H_

#include "ash/public/cpp/frame_header.h"
#include "base/callback.h"
#include "base/macros.h"
#include "ui/gfx/image/image_skia.h"

// Helper class for drawing a custom frame (such as for a themed Chrome Browser
// frame).
class BrowserFrameHeaderAsh : public ash::FrameHeader {
 public:
  class AppearanceProvider {
   public:
    virtual ~AppearanceProvider() = default;
    virtual SkColor GetTitleColor() = 0;
    virtual SkColor GetFrameHeaderColor(bool active) = 0;
    virtual gfx::ImageSkia GetFrameHeaderImage(bool active) = 0;
    virtual int GetFrameHeaderImageYInset() = 0;
    virtual gfx::ImageSkia GetFrameHeaderOverlayImage(bool active) = 0;
  };

  // BrowserFrameHeaderAsh does not take ownership of any of the parameters.
  // |target_widget| is the widget that the caption buttons act on.
  // |view| is the view into which |this| will paint.
  BrowserFrameHeaderAsh(
      views::Widget* target_widget,
      views::View* view,
      AppearanceProvider* appearance_provider,
      ash::FrameCaptionButtonContainerView* caption_button_container);
  ~BrowserFrameHeaderAsh() override;

  // Returns the amount that the frame background is inset from the left edge of
  // the window.
  static int GetThemeBackgroundXInset();

  // FrameHeader:
  void UpdateFrameColors() override;

 protected:
  // FrameHeader:
  void DoPaintHeader(gfx::Canvas* canvas) override;
  views::CaptionButtonLayoutSize GetButtonLayoutSize() const override;
  SkColor GetTitleColor() const override;
  SkColor GetCurrentFrameColor() const override;

 private:
  // Paints the frame image for the |active| state based on the current value of
  // the activation animation.
  void PaintFrameImages(gfx::Canvas* canvas, bool active);

  AppearanceProvider* appearance_provider_ = nullptr;

  DISALLOW_COPY_AND_ASSIGN(BrowserFrameHeaderAsh);
};

#endif  // CHROME_BROWSER_UI_VIEWS_FRAME_BROWSER_FRAME_HEADER_ASH_H_